Pressure relief valves are safety devices that prevent dangerous pressure buildups in pressurized systems. They can be set to open at a specific pressure or temperature and are required by law for safety reasons in many regions. A classic example is the valve fitted to a water heater that “vents” if the temperature or pressure of the water inside gets too high. Regular testing is highly recommended.
A pressure relief valve (PRV) is a safety device designed to divert pressure in the event that a pressurized system of some kind encounters a problem leading to a dangerous increase in pressure. A classic example of this type of valve is the valve fitted to a water heater that “vents” if the temperature or pressure of the water inside gets too high, preventing catastrophic failure of the water heater. Pressure relief valves are extremely useful and required by law for safety reasons in many regions.
The idea behind a pressure relief valve is that it provides an outlet for dangerous pressure buildups. Both gases and liquids under pressure can be regulated with the aid of this type of valve. In the event that the pressure in the system gets too high, instead of blowing out the entire system, the pressurized liquid or gas will vent out of the pressure relief valve, lowering the pressure and preventing a serious accident.
Pressurized systems are used to move various liquids and gases, with the force of the pressure pushing the substance through a series of tubes. In a house, for example, the pressure in the system is what gets the water flowing when you turn on a faucet; in the event of a loss of pressure from the tap, nothing will come out. However, if the pressure is high enough, it could cause an explosion, unless a safety valve is in place. High pressure can also damage devices connected to the system, or it can cause unexpected outcomes, such as a burst of flame from a gas burner when it is lit, or unusually high water pressure from a faucet which could surprise a user .
Pressure relief valves can be set to open at a specific pressure or temperature. They are often located outdoors, to prevent damage from leaks and spills. Many systems have a safety device in place, so that when the valve opens, the system shuts down or otherwise alerts the user of a problem.
In the case of a water heater, the valve is actually a temperature pressure relief valve (TPRV or TPR valve). These valves are calibrated to open and release water when the temperature or pressure gets too high and can be tested by flipping up the lever on the front of the valve to see if water is escaping. Regular testing is highly recommended, as an exploding water heater can cause a significant amount of damage, easily blowing through support beams and walls.
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